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정재수,이찬식,Jeong, Jae-Soo,Lee, Chan-Sik 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.2
콘크리트는 구조용 재료의 하나로 인식되어 많은 연구개발 및 적용이 검토되어 왔지만, 의장적 기능을 가지는 마감재로서의 콘크리트 관리방안에 대한 연구는 부족했다. 노출콘크리트는 일반 콘크리트에 비해 더욱 많은 공사비와 체계적인 품질관리가 요구됨에도 불구하고 품질관리 방안이 구체적으로 확립되어 있지 않다. 이에 본 연구에서는 노출콘크리트 노출면의 품질확보를 위해 기존 연구 및 사례를 조사하여 품질에 영향을 미치는 다양한 요인을 분석하고, Mock-Up 실험을 통해 거푸집 제작, 콘크리트 배합, 콘크리트 타설 방법에 따른 노출콘크리트면의 품질을 비교분석하였다. 콘크리트 배합 측면에서는 단위결합재량, 단위수량, 시공측면에서는 거푸집 종류, 슬럼프, 다짐시간, 다짐방법 등 시공단계의 품질관리 기준을 제시하여 노출콘크리트의 품질관리를 위한 기초자료를 제공하고자 한다. A variety of studies on concrete have been performed to examine the advantages for structural material, but less attention has been paid to the contribution of concrete to finishing. Due to this matter, specific management guidelines for construction and quality on exposed concrete have not been clearly established despite more construction cost and quality control are required. This study analyzed a impact factors on the quality by survey of the existing research and practice. Field tests were performed using mock-up models to analyze the quality of exposed concrete according to form manufacture method, concrete mix proportion, and concrete placing method. Results indicate that the quality of exposed concrete was determined by concrete mix proportion and construction managements. Guidelines of quality control on exposed concrete in construction stages were proposed.
정재수,정수일 대한안전경영과학회 2003 대한안전경영과학회 학술대회논문집 Vol.2003 No.05
In this study, it was researched a kind of the press machines which had been retained in the domestic press working companies. And then it was analysed the present conditions with the working types, the size of companies, the aging types and the continuous working periods. Specially, the purpose of this paper is decreased the industrial accidents of the domestic press working companies by the proposing the safe prevention which are obtained by the analysing the accidential reasons.
정재수,정수일 대한안전경영과학회 2001 대한안전경영과학회 학술대회논문집 Vol.2001 No.05
The purpose of this paper is to supply the principal methods for the safety in the press industrial accident preventions and the basic analyzing theory in the press industrial accidents. It was reached the press machine installed companys and was analyzed the accident characteristics, types, the worker's working period and the distributed worker's age of the happened the press machine industrial accidents. The direct reasons are almost reasons of the press industrial accidents. But it should be not ignore the indirect reasons of the accidents In this study, it was presented that the safety devices is selected by the analyzed reasons in the press industrial accidents for the principal accident prevention.
AE 센서를 이용한 CNC 공작기계의 절삭공구 마모에 관한 연구
정재수,김광태,정수일 대한안전경영과학회 2000 대한안전경영과학회지 Vol.2 No.3
Increased complexity of products and their manufacturing processing demans higher quality control and monitoring than ever before. Therefore, flexible automatization or flexible manufacturing systems (FMS) offer numerous advantages over alternative manufacturing methods. In this state, a in-process monitoring is one of the important flexible automatino system. And as use of NC and CNC machine tool has been increasing, cutting work has automating and it is necessary to develop the automatic production system combined a couple of machine tool. Thus, in this paper to search examination it can measure the tool wear and the tool life and can be more practical research subject.